Optional. Use DPVIN to activate Delivery Point Validation (DPV) and Residential Delivery Indicator (RDI) processing and to process options on multiple matches to the ZIP + 4 database. DPV and RDI processing use a separate license from CODE-1 Plus. The license must be loaded in order for this parameter to properly function. For more information on DPV and RDI, refer to Chapter 7, Using Delivery Point Validation in your CODE-1 Plus User's Guide.
Currently, the USPS ZIP + 4 file consists of ranges of addresses. This means that if a given house number is entered on the input and that number falls within the range of the USPS ZIP + 4 file, the address will be validated regardless of whether the house number actually exists. DPV allows you to determine whether an actual address exists, right down to the apartment or suite level. DPV allows you to validate that your address information is a physical address served by the Postal Service. RDI allows you to determine if an address is a residential or business delivery point.